's a good idea," agreed Tom, "Dad's so interested in our work I can spend a lot more money on instruments and he won't mind and school will soon be over and we can devote all our time to it. Gosh, I bet we have the best sets of any boys in the whole of New York! Say, won't it be great when we can hear messages from England and Germany and France?"

"Yes, and we want to get busy on a sending set too. It's twice as much fun when we can talk to others as well as hear them. And say! my folks are going to Europe next month. If your mother and father don't mind I could stay here with you."

"That's bully! Of course mother won't mind and Dad will be glad to have you," declared Tom. "We're not going any place this summer and so we can give all our vacation to radio. Say, we may make some big discovery or invention. I was reading the other day about how many things there are to be done in radio yet and the fellow that wrote it said he believed some of the big things would be discovered by